RB911 is with AR93xx radio chip, but when I add channel list with nonstandard channel width (device have “extra channels” license)
But the board say “-in scan-list unsupported channel”?

I was asking this also
http://forum.mikrotik.com/t/rb912uag-and-extra-channels/70195/1
no answer
c’mon MT team
Does AR93xx support 30Mhz channel width?
is it hardware or OS limitation for now?
/interface wireless set numbers=0 frequency-mode=superchannel scan-list=5100-5500
Really? Are you sure?
AR93xx chipset doesn’t support those custom channel features at the moment.
Currently only AR92xx wireless chipset devices support that feature:
http://wiki.mikrotik.com/wiki/Manual:Wireless_Advanced_Channels#Hardware_support